Seems we have a bad habit of picking up players that "don't fit our system" and then playing them heavily in roles they aren't suited for.

Exactly.

There's a specific skill-set required to play WR in our 'system' and Jacoby did not excel at it. It's not his fault mind you, because fighting-off-double-coverage-to-retrieve-an-under-thrown-pass, is a difficult skill mastered by only a handful of elite receivers.